Pronunciation...

You can learn a lot of aspects of pronunciation by going to YouTube and searching for "pronunciation esl rachel"... There are a few that I really like, and they can be accessed by typing "pronunciation esl rachel intonation" in YouTube.

Also, here are some other links to useful websites:

Sounds
https://pronuncian.com/sounds/

Diphtongs
 http://clas.mq.edu.au/speech/phonetics/phonetics/vowelgraphs/USE_Diphthongs.html

Stress
http://www.eslfocus.com/articles/phonology_syllable_stress-491.html

 https://www.toeflgoanywhere.org/learn-these-4-word-stress-rules-improve-your-pronunciation

http://www.really-learn-english.com/word-stress.html

Linking
https://pronuncian.com/introduction-to-linking/

 http://www.elementalenglish.com/connected-speech-linking-american-english-pronunciation/